Please don't take this as a flame, it's not meant to be, just a thought.
1) Just about every criminal given the DP tries to get it reduced to LWOP or less. I have yet to hear of a criminal given LWOP who has asked for the DP instead. If the one who has to suffer the punishment feels the DP is more severe then I would not question that conclusion.
2) Alternatively, if LWOP IS a harsher punishment, shouldn't compassion dictate that the criminal be given the less cruel punishment - DP?
Also, we cannot let criminals go unpunished because of the threat of retalliation from their followers - every criminal has someone that supports them, if you follow this all the way to the point where you don't put a burglar in jail because it will upset his children we lose the ability to punish anyone.